Needle-motion



F. E. VALOIS.

NEEDLE MOHON. APPLICATION nun we. 1. ma. RENEWED my 8.1920.

1,368,418. Patented Feb. 15,1921.

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NEEDLE MOT APPLICATION FILED AUG. 1, I918. WED JULY 8. 1920.

1,368,418 Pat/antad Feb. 15,

SHEET UNITED STATES PATENT OFFICE.

FELIX. EMILE VALOIS, OI BBIDGEPOBT,

CONNECTICUT,

ASSIGNOB T0 11mm. snout GHUSETTS.

REEDLE-MOTION.

Application filed August 1, 1918, Serial No. 24?,

T 0 all whom it may concern:

Be it known that I, FELIX EMILE Vanors, a citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented a certain new an useful Improvement in Needle-.Motions, of which the following is a specification, referones being had therein to the accompanying drawings.

My invention relates to sewing machines having a curved hook needle of the kind ordinarily employed in the manufacture of boots and shoes. The invention has to do particularly with the needle actuating mechanism or needle drive for such a machine.

The particular ob'cct of the invention is to provide needle (rive which the machine to be run at high speed and to operate without unnecessary vibration or It has for a further object to provide a needle drive in which no cams. racks or pinions are employed and which will therefore have greater durability as well as greater smotln ness of operation. A. further object of the invention is to give to the needle certain va-- riations in an 'ular velocity which will produce more per iect coiiperation with the other stitch forming instrumentalities.

All of the foregoing objects are accomplished by my invention and the machine embodying it is simple, economical to manufacture and effective in its operation. It may be run at exceedingly high speeds with a minimum of vibration and noise.

In the accompanying drawings only those parts of the machme which relate directly to the needle drive are shown since the remainder of the machine forms no part of my present invention.

The invention will be fully understood from'the following description when taken in connection with the accompanying drawings and the novel features thereof will be pointed out and clearly defined in the claims at the close of this specification.

In the drawings, Figure 1 is a side elevation of the partsof a needle drive of a sewin machine embodying my invention.

l igs. 2, 3 and 4 are similar views showin successive positions of the needle drive.

ig. 5 is a top plan view of the parts shown in Fig. 1.

Fig. 6 is a die ram illustrating the movement of the need e.

Specification of Letters Patent.

shall permit Patented Feb. 15, 1921.

752. Renewed July 8, 1929. Serial No. 394,897.

Referring now to the drawin are shown parts of the frame 0 At 11 is shown a curved hook needle of the usual form. At 13 is shown the work support or table. The needle 11 is mounted on a needle sector 12 pivoted on the needle shaft 14 so that the needle sector and the needle are capable of being oscillated about the needle shaft in proper relation with the other stitch forming instruinentalities among which is a shuttle 15.

At 16 is shown the main shaft of the machine. This main shaft revolves with uniform angular velocity and is actuated by mechanism which is not shown. On the main shaft 16 is a crank 17 having a relatively large crank pin 18. The crank revolves about the main axle 16 in the direction of the arrow in Fig. On the crank pin 18, is a connecting rod 19 of skeleton shape as shown, the free end of which is pivoted at 20 to the upper end of an L-shaped link 21 the other end of which is pivoted at 252 to the needle sector at one side of the crank. The movement of the connectin rod 19 is in part controlled by means of a lin or movable fulcrum 23 one end of whih is pivoted at 24 to a fixed part of the machine farther from the needle sector than shaft 16 and above the same and the other end of which is pivoted at 25 to the connecting rod 19 at a point intermediate the crank pin 18 and pivot 20, and at one side of a straight line passing through the center of the crank pin 18 and the center of the pivot 20.

When the needle is at the lowest oint of its stroke, the crank 17 will be in the position shown in Fig. 1. The path of the center of the crank pin 18 is indicated in dot and dash line in Fig. 1 on which certain positions have been indicated by letters. The path of the needle will be better understood by comparing the diagram (see Fig. 6) with the positions indicated on the dot and dash circle in Fig. 1. The diagram forming Fig. 6 is a horizontal projection of the point of the needle in its various positions. Let it be assumed that the needle starts at the position shown in Fig. 1. At this time the needle will be at the point indicated by it in Fig. 6 and the center of the crank pin will be at the position designated (a in Fig. l. The crank pin then moves to the position shown in 1g. 2. The center of the crank s, at A and B the machine.

pin will then be at the point 5 (see Fig. 1) and the needle will be at the point i) in the diagram in Fig. 6. The crank then moves to the position shown at 0 '(see Fig. l) and the needle moves down slightly as indicated at c in Fig. 6. Further movement of the crank pin to the position (1 (see Figs. 1 and 4:) carries the needle to the position a? in the diagram which position is above the point 6 therein and is the extreme top position reached by the needle. The travel of the crank pin from a? to a brings the parts back to the starting point this being indicated by a in Fig. 6.

From the foregoing it will be seen that the needle travels very rapidly during its up stroke and until it reaches the point Z). (See Figs. 2 and 6). The needle then remains practically stationary but having a slight dip from b to c, sufiicient to loosen the thread from the barb of the needle, while the crank travels to the point (i at which time the needle is slightly higher and farther back out of the way than it was at the point The down stroke from the point d to a. oint opposite the point 0 is very slow at first after which the rapidity of movement of the needle increases suddenly until the extreme bottom position is reached.

The needle practically rests or dwells at a point near the top of its stroke while the crank moves through an angle of about 40 degrees and then moves up and back out of the way of the shuttle to clear the thread to allow the shuttle to pick the loop up from the needle and to give the shuttle time to ass through the loop and the needle to get ack out of the way of the shuttle.

In spite of the rapidity of movement given to the needle, and the long rest or pause, the machine runs very smoothly and quietly owing to the fact the needle drive contains no cams or racks.

What I claim is:

1. In a. sewing machine, the combination of an oscillatable needle sector, a crank, a connecting rod, connections between the needle sector and the connecting rod, and a movable fulcrum connected to the connecting rod at a point intermediate of its ends said parts being so related that said sector has a substantial dwell near one limit only of its motion.

2. In a sewing machine, the combination of a crank, a connecting rod one end of which is attached to the crank, a needle sector actuated by the other end of the rod, and

a movable fulcrum acting on the connecting rod at a point between the ends of the connecting rod said parts being so related that the needle is caused to dip near one limit of its stroke.

3. In a sewing machine, the combination of a crank, a connecting rod one end of which is pivoted on said crank, a needle sec tor pivotally connected to the other end of said rod, and a link forming a movable fulcrum, one end of said link being connected to the connecting rod at a. point between the ends thereof and at one side of a line connecting its pivotal connections, and the other end of said link being pivotally supported.

4. In a sewing machine, the combination of a drive shaft, a crank thereon, a connecting rod one end of which is attached to said crank, a link pivoted at one end at a fixed point above said crank and at the other end to an intermediate point of said connecting rod, an oscillatable needle sector mounted at one side of said crank, and connections from said sector to the other end of said rod.

' In a sewing machine, the combination of a crank, a connecting rod, an oscillatable needle sector. connections between said rod and said sector, and a link forming a movable fulcrum one end being pivoted to said rod and the other end pivoted at a fixed point at a distance from said sector not less than that of the center of rotation of said crank.

6. In a. sewing machine, the combination of a crank, a connecting rod one end of which is attached to the crank, an oscillatable needle sector, a link connecting the free end of the connecting rod with the needle sector, and a. link one end of which is pivoted to a fixed part of the machine and the other is pivoted to the connecting rod at a point intermediate its ends In a sewing machine, the combination crank, a. connecting red one end of is attached to the crank, an oscillatable needle sector, a link connecting the free end of the connecting rod with the needle sector, and a link one end of which is pivoted to a. fixed part of the machine and the other is pivoted to the connecting rod at a point intermediate its ends and at one side of the line connecting the center of the crank pin with the pivot at the other end of the connecting rod.

In testimony whereof I afiix my signature.

FELIX EMILE VA LOIS. 

